Fixed the Scrub_Null_ReturnsNull test with a little String.IsNullOrWhiteSpace check.
Fixed the Scrub_Null_ReturnsNull test with a little String.IsNullOrWhiteSpace check.

xpicio/raven-csharp,getsentry/raven-csharp,getsentry/raven-csharp,xpicio/raven-csharp,webaction/raven-csharp,getsentry/raven-csharp